Capacitive coupling induced Kondo-Fano interference in side-coupled double quantum dots

doi:10.1088/1674-1056/ab8ac1

Abstract We report capacitive coupling induced Kondo-Fano (K-F) interference in a double quantum dot (DQD) by systematically investigating its low-temperature properties on the basis of hierarchical equations of motion evaluations. We show that the interdot capacitive coupling U₁₂ splits the singly-occupied (S-O) state in quantum dot 1 (QD1) into three quasi-particle substates: the unshifted S-O₀ substate, and elevated S-O₁ and S-O₂. As U₁₂ increases, S-O₂ and S-O₁ successively cross through the Kondo resonance state at the Fermi level (ω=0), resulting in the so-called Kondo-I (KI), K-F, and Kondo-II (KII) regimes. While both the KI and KII regimes have the conventional Kondo resonance properties, remarkable Kondo-Fano interference features are shown in the K-F regime. In the view of scattering, we propose that the phase shift η(ω) is suitable for analysis of the Kondo-Fano interference. We present a general approach for calculating η(ω) and applying it to the DQD in the K-F regime where the two maxima of η(ω=0) characterize the interferences between the Kondo resonance state and S-O₂ and S-O₁ substates, respectively.

Keywords: Kondo effect Fano effect quantum dot capacitive coupling

Received: 21 February 2020
Revised: 17 April 2020
Accepted manuscript online:

PACS:	72.15.Qm	(Scattering mechanisms and Kondo effect)
	73.63.Kv	(Quantum dots)
	75.20.Hr	(Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11774418, 11374363, and 21373191).

Corresponding Authors: Jian-Hua Wei
E-mail: wjh@ruc.edu.cn

Cite this article:

Fu-Li Sun(孙复莉), Yuan-Dong Wang(王援东), Jian-Hua Wei(魏建华), Yi-Jing Yan(严以京) Capacitive coupling induced Kondo-Fano interference in side-coupled double quantum dots 2020 Chin. Phys. B 29 067204

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Capacitive coupling induced Kondo-Fano interference in side-coupled double quantum dots

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